The wifes Magene (2003) sounds like it has running water behind the dash, this happens when turning corners, you get a water gurgling sound from behind the air vents, any ideas what it couls be? had a look under the hood and cant see anyting obvious, air con maybe?
i had those 2 exact problems with my megane hatchback
1) sloshing sound in dash, by passenger foot well. This is a normal sound and something to do with the construction.
2 I noticed my maps in the side storage units, and the floor storage units were wet. there is a seal problem with the door. The garage fixed it for free. This was a common problem and the garage knew exactly what I was talking about ( In wales).